Retired Expat
Full time employment: Posting here.
How old are your TVs? I think almost all name brand smart TVs built in the past 10 years or so are wifi capable for streaming.
We cut the cord years ago but don’t us smart TVs. So long as you have an HDMI input you can us le a Roku or Fire stick or chrome cast. All a cheaper and easier solution than using the built in Smart TV interface. But if you don’t have good and fast WiFi at home you may need to upgrade your router. Most people use the router/modem their ISP provides and they are usually slow 2.4ghz models.
A good mesh router which is expandable is a joy!